Pneumatic lifting-jack.



1. HOLLOWAY.

PNEUMATIC LIFTINGJACK.

APPLICATION FILED JAN. 19. 1915.

Patented Dec, 4, 1917.

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1 hTltThh parent oration,

JOHN H. HQLLUWAY, 01B LA FAYETTE, INDIANA,

PNEUMATIC LTFTHl'G-JACK aaaagaai.

tpeclflcatlon of lLetters Patent.

Patented Dee, d, fhfh Application filed January 19, 1916. Serial No. mote.

bad to the accompanying drawings and to the letters and figures of reference marked thereon.

- This invention relates to the type of lift ing-jack that is designed to be operated by ,mcans of fluid pressure, and more especially by means of compressed air to be supplied by an air compressor or pump separately from the lifting-jack, the invention having reference more particularl to a pneumatic lifting-jack that is particu arl adapted for liftin vehic es clear of the ground or shop floor and support the axle of the vehicle to permitthe wheel or the tire thereof to be removed, more especially when tire repairs are re uired.

object of the invention is to provide a substantial and relatively inexpensive lifting-jack of such construction as to be espeeiallyreliable and convenient for use in shops,-- garages or elsewhere for lifting and supporting-either end portion of an automobile axle to permit convenient replace ment. or repair of the pneumatic tire of the adjacent wheel.

' Another object is to provide a pneumatic lifting-jack of such construction as to be thoroughly reliable in operation and not liable to accidentally lower its-load with posible damage thereto in case the vehicle wheel is removed, which jack shall be of light weight and not liable to accidental injury, andconvenient to be carried as part of an automobile equipment to be operated by compressed air which may be supplied from a compressor or stora e reservoir with which the automoblle may e provided.

With the above-mentioned and other objects in view, the invention consists in a' pneumatic lifting-j ack having novelfeatures of construction, more particularly with reference to locking means for preventing accidental lowering of the load on the jack; the invention consisting also further in the parts, and combinations and arrangements of parts, as hereinafter particularly dethe wheelsof automo iles or other scribed and further defined in the accompanying claims;

Referring to the drawings, Figure 1 is a side elevation of the improved jack, broken lines indicating the approximate position of the jack on llftin one end portion of the vehicle axle; Fig. 2 1s a vertical central sectional view of the jack; Fig.3 is a sectional plan approximately on the plane of the line A A on Fig. 2; Fig. 4: is a sectional plan also on the line A A and partiall broken away, the jack being slightly modi ed; Fig. 5 is a perspective View of a locking appliance for securely supporting. the ram of the jack when elevated; Fig. 6 is a fragmentary central section showing the preferred form of construction of the upper portion or top of the jack body; and, Fig. 7 is a central section of a slightly modified form of body top corresponding to that shown in Figs. 1, 2 and 4.

Similar reference characters on the difierent figures of the drawings indicate corresponding elements or features of construction herein referred to. v A practical embodiment of the invention comprises ahollowcylindrical main part 1 having a bottom or base 2 that has a rounded or convex under face to enable the jack to be turned over from a vertical to an inclined position when in use, order to permit smooth operation of the jack without there being a tendency of the jack to slip from under its load. Preferably the exterior of the main-part is provided with a handle 3. The main-part of the jack is provided with a head or top member t which may be connected to the normal upper end of the cylindrical portion of the main part by various approved means, so as to be substantial and capable of withstanding the load that may be required of it. The top of the head 41: has a central boss 5 thereon in which is a'g'uide bore 6 that extends through the head, Une side porantenna engaging a portion of said head to yieldlngly draw the lock bar to said rod, a piston in the main part fixed to said rod, and

anair duct connected with the main part ad acent to the supporting bottom.

2. A pneumatlc lifting-jack comprising av hollow c lindrical main part, a supporting bottom ed to the normal lower end portion of the main part, a head fixedly secured to the upper end portion of the main partzontal slot extending through one side thereof the head tion of the main art, a head fixedly secured of, a lock bar movably guided in the slot and extending beyond the adjacent portions of the boss, a spring supported on a portion and engaging the lock bar to yieldingly hold the lock bar in the slot, a piston movable in the main part, a rod secured to the piston and extending through the guide bore in contact with the lock bar, the rod having notches in its side to separately receive the lock bar for support, a sadd e on (he top of the rod, and an airduct connected with the main part adj ace'nt to the s porting bottom.

3. A nuematlc lifting-jack comprising a l hollow cylindrical main part, a supporting bottom fixed to thenormal lower end porto the upper en. portion of the main part, the head havinga guide bore therein, a lock bar pivoted to the top of the head and movable adjacent to the guide bore, said bar having a pnojecting arm, a notched rod movable in said bore to be engaged by said bar, a spring supported on a portion of said head and engaging said bar to yieldingly hold it to said rod, a piston in the main part fixed to said rod, an air-duct connected with the main part adjacent to the supporting bottom, and a controlling lever pivotally connected between. its ends to the top of said head and having one of its end portion'sin contact with the arm of said lock bar to oppose the action of said spring, the poslte end ortion of said lever extending eyond said ead.

4. A pneumatic lifting-jack comprising a tu hollow cylindrical main part, a supportlng bottom' fixed to the normal lower end por-. tion of the main-part and having a convex under face, a head fixedly secured to the upper end portion of the main part and havlng a boss on the top thereof and a guide bore extending through the head and the boss, the wall of the boss having a horizontal slot extendin through one side thereof, a lock 'bar'mova 1y guided in the slot and extending beyond the adjacent portions of the boss, a coil spring connected at its ends to the lock bar adjacent to the opposite sides of the slot and extending about the oppo-- site side of the wall of the boss in contact therewithvto'yieldingly hold the lock bar in the slot, a piston movable in the main part, a rod secured to the piston and extending through the guide borein contact with the lock bar, the rod having circumferentiallyextending grooves therem to separately receive the lock bar for support, the lower .Wall of one of the grooves being conical to force the lockbar from the groove on up- Ward movement of the rod, a saddle on the top of the rod, and an air-duct connected w1th the main part adjacent to the supportin bottom.

n testimony whereof, I ailix my signature,

in presence of two witnesses.

- JOHN H. HOLLOWAY.

Witnesses:

EMMA L. Rnsnn, SEPTIMIUS VA'rnn. 

